The driver of the first of two San Francisco Fire Department rigs that struck a 16-year-old survivor of the Asiana Airlines plane crash in July was alerted less than 15 minutes earlier to avoid the girl as she lay on the ground, newly obtained camera footage shows. The footage, taken by a dashboard camera aboard the rig and reviewed Thursday by The Chronicle, sheds new light on the circumstances surrounding the death of Ye Meng Yuan. Several firefighters who responded to the July 6 crash have told investigators they believed Ye was dead and that they had concentrated on rescuing passengers and crew members who were still aboard the burning Boeing 777. The rig camera's footage shows that although the plane had crashed just a few minutes earlier, passengers were gone from the area where Ye lay crumpled, and at one point a firefighter walked past her without looking down. The recording shows the rig, driven by firefighter Jimmy Yee, approaching the scene within minutes after the 11:27 a.m.